External blog: http://www.teslamotors.com/blog

From this passage, I can see that tesla have a really advanced presell system. It provides a convenient way for customers to order the cars simply online. And the car would be delivered to an appropriate spot that is suitable for client to pick up. This selling stream is definitely satisfied by customer since it reduces much effort that the customers have to deal with during the transaction.
However, there is unavoidable risk during the deal as far as I concern.The internet technology is so booming today that some lawbreaker may use this advanced technology to commit a crime. During the transaction in the internet, there remains pretty bugs that may lead people to the wrong page and that may be a trap of getting the personal information. Customer may run at a loss if they get into the trap. Let alone the deposit for a car is large so the bad people would target more on it.
To sum up, the shortcut of booking a car is convenient by using the Internet, but at the same time Tesla is supposed to strengthen its safety system to ensure the interest of the customers.